Template.yaml

# This is a hello world HOT template just defining a single compute instance
heat_template_version: 2013-05-23

description: Test-template

parameters:
  KeyName:
    type: string
    description: Name of an existing key pair to use for the instance
  InstanceType:
    type: string
    description: Instance type for the instance to be created
    default: m1.small
    constraints:
      - allowed_values: [m1.small]
        description: Value must be one of 'm1.small'
  ImageId:
    type: string
    description: ID of the image to use for the instance

resources:
  group:
    type: AWS::AutoScaling::AutoScalingGroup
    properties:
#      Cooldown: '60'
      DesiredCapacity: 7
      MinSize: '1'
      MaxSize: '10'
      LaunchConfigurationName: {Ref: launch}
      AvailabilityZones: {'Fn::GetAZs':''}

  scaleUpPolicy:
    type: AWS::AutoScaling::ScalingPolicy
    properties:
      AutoScalingGroupName: {Ref: group} #Ref und Klammern hinzugefügt
      ScalingAdjustment: 1
      AdjustmentType: ChangeInCapacity

  scaleDownPolicy:
    type: AWS::AutoScaling::ScalingPolicy
    properties:
      AutoScalingGroupName: {Ref: group} #Ref und Klammern hinzugefügt
      ScalingAdjustment: -1
      AdjustmentType: ChangeInCapacity
      
  launch:
    type: AWS::AutoScaling::LaunchConfiguration
    properties:
      KeyName: { get_param: KeyName }
      InstanceType: { get_param: InstanceType }
      ImageId: {get_param: ImageId}

  RAMAlarmHigh:
    type: OS::Ceilometer::Alarm
    properties:
      description: Scale-up if the average RAM > 50% for 30 Seconds
      meter_name: cpu_util
      statistic: avg
      period: '30'
      evaluation_periods: '1'
      threshold: '50'
      alarm_actions:
      - {"Fn::GetAtt": [scaleUpPolicy, AlarmUrl]}
      comparison_operator: gt

  RAMAlarmLow:
    type: OS::Ceilometer::Alarm
    properties:
      description: Scale-down if the average RAM < 30% for 30 Seconds
      meter_name: cpu_util
      statistic: avg
      period: '30'
      evaluation_periods: '1'
      threshold: '30'
      alarm_actions:
      - {"Fn::GetAtt": [scaleDownPolicy, AlarmUrl]}
      comparison_operator: lt

#outputs:
#  instance_ip:
#    description: The IP address of the deployed instance
#    value: { get_attr: [instance, PublicIp] }